Unauthorised package increase.

Vodacom has recently increased the price of my package by R47 without informing me. When I call to ask the reason, they said the package I am on has not increased in 3 years so it was due to increase. I checked my contract T&Cs and there is nowhere that states that the price of my package can increase at any time. A consultant from Cancellations (As i asked for a closing balance so I can pay off my contract and close it) said i should pay X amount and fax the documents to them. I informed her that I have access to email and not fax. She proceeded to tell me that I should find an internet cafe. Who uses fax in 2018? And where on earth do I find an internet cafe??? Worse I will have to pay +- R10 a page to fax documents through all because I want to close my account. Appalling service!